Fluid end pump head



Sept. 1, 1953 B F. WALDRON FLUID END PUMP HEAD Filed June 19, 1951 /7 i Mimi INVENTOR,

ATTORNEYS,

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Patented Sept. 1, 1953 UNITED STATES PTENT OFFICE 2 Claims.

This invention relates to pump construction, and more particularly, has reference to pump heads including means extending therethrough and adjustably positioned in the head to engage one end of a cylindrical liner that constitutes a conventional part of said pump construction.

Pumps used for delivering a fluid under pressure, for example a well drilling fluid, are provided with liners which are shiftable longitudinally of the pump cylinder, so as to be adjustably tightened to seal the packing normally interposed between shoulders on the liner and cylinder respectively. Customarily, the pump head is provided with a threaded opening, in which is threadably engaged set screws that are threadable through the head and against the end of the liner.

This arrangement, however, has a pronounced disadvantage, arising from the fact that the cooperating threads in the head and screws wash out or loosen, so as to permit leakage there through or corrosion of the threadedly engaged portions. This, in turn, prevents proper tightening of the liner to seal the packing.

The main object of the present invention is to provide a pump head construction in which the threads conventionally formed in the head will be completely eliminated, eliminating in turn threads on the adjusting means that extends through the head into abutting relationship with the end of the liner.

With the foregoing and other objects in view which will appear as the description proceeds, the invention consists of certain novel details of constructon and combinations of parts, hereinafter more fully described and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

Referring to the drawings,

Fig. 1 is a longitudinal section through the end of a pump cylinder and head mounted there- Fig. 2 is an end elevation.

Referring to the drawings in detail, a conventional pump cylinder I in the present instance, but not necessarily, is provided with the upstanding extension 2. The cylinder is counterbored at 3, the counterbore being formed in the bell end 4 of the cylinder.

A liner 5 fits within and is adjustable longitudinally of the cylinder l, and at one end is provided with the liner cage 6. Interposed between opposed shoulders on the liner and cylinder l is packing 6'. Adjustment of the liner to the right in Fig. l tightens the liner against the packing.

Formed in the bell end 4 is a circumferential series of threaded recesses 1 receiving threaded studs 8 on which are provided nuts 9, to secure tightly to the cylinder a circular pump head In.

The construction which has so far been described is conventional and does not constitute, per se, part of the present invention.

In accordance with the present invention, I form in the head Ill one or more tapered openings ll extending completely therethrough. Three such openings are provided in the present instance. The number can, however, be more or less.

In each opening I l is tightly wedged the frusto-conical base l2 of a tubular member that has, integral with the base, an externally threaded extension [3 outstanding from the exterior surface of the head. The tubular member is formed with a smooth-walled cylindrical bore [4 extending completely therethrough.

To prevent leakage between the base and head an outer sealing ring I5 is recessed in the exterior surface of the base, while inner sealing rings 56 are recessed in the surface of the bore M.

A smooth-surfaced piston [1, having one end projecting into the interior of the pump cylinder I, is snugly fitted in the bore of the tubular member, and is adjustable longitudinally thereof into engagement with the liner cage 6.

For the purpose of retaining the tubular member in tightly wedged relationship with the openings II of the head, jam nuts l8 are threaded upon the threaded extensions [3 against the exterior surface of the head.

Also threaded on the extensions [.1 are adjusting sleeves I9, having closed ends 20 the outer configuration of which is proportioned to receive a wrench or the like.

The closed ends of the adjusting sleeves l9 engage the outer ends of the pistons I1, and I believe it will be apparent that upon threading of the sleeves [9 toward the pump head, the piston I! will be adjusted slidably of the tubular member, to the right in Fig. 1, so as to shift the liner 5 to the right in Fig. 1, thereby to tighten the liner within the pump cylinder.

By reason of the arrangement illustrated and described, it is seen that the piston which engages the liner does not have threaded engagement with the pump head, and eliminates the washing out of threads formed in the pump head. As a result, proper tightening of the liner is continuously assured, thereby to seal the packing 6'.

I prefer that the threaded portion l3 of the tubular member be substantially long, and that the adjusting sleeve l9 be proportionately long, so as to provide sufiicient threads for proper adjustment of the liner.

The arrangement, additionally, has the important characteristic that it permits repairs to be made directly on 'the :site, without "necessity of removing the-pump hea'd and takingit to arepair shop for remachining thereof. In the event the tubular member needs replacement, this can-abe having at least one tapered opening; a tubular ,member "having .a base tapered correspondingly to said opening, sa'idbase'being wedgaibly'engaged in the opening, said tubular member including an exteriorly threaded extension outstanding from the-external surface of theihead; 'a jam'nut threaded on said extension and against the external surface of the-head, there being an tend- 'to-end bore formed in'said tubular "member; a

piston slidable in said bore and abutting at one end against the liner; and an adjusting sleeve threaded on said extension, said 'adju'stingsl'eeve with a liner mounted within and-ad justabledongi tudinally of said cylinder, of a head secured toand closing One end of the cylinder, said head having a closed end engaging the other end of the piston, whereby to adjust the piston longitudinally of said tubular member responsive to threading of said sleeve upon the extension.

2. The combination, with a pump cylinder and with a liner mounted within and adjustable longitudinally of said cylinder, of a head secured to and closing one end of the cylinder, said head being provided with an annular series of tapered circumfenentiaJ-ly spaced openings extending therethrough, tubulargmembers haying correspondingly tapered exteriors extending through and wedgably engaging the walls of the openings, said tubular members projecting beyond the outer surface 'df the head and being externally screw threaded,.-jam. vnuts threadedly engaging the thread on the tubular extensions for engaging m m dganditightly wedging the tubular membersin the tapered openings, pistons mounted in the tubular members for projecting longitudinally therethrough, and adjusting sleeves threadedly 'e'ngaglngthe'threads onthe extensions and-carrying end closing heads 'for engaging the pistons for advancing the pistons toward the cylinder liner.

BENJAMIN NVALDRON.

References Cited :in :the file of "this patent UNITED .STATES ,PAF-EENTS Name Date Shimen May15, .1942 

